Moonlight holds the words moon and light, seashell holds sea and shell, and sidewalk holds side and walk, so each one is a compound word. Rabbit, yellow, and blanket cannot be chopped into two smaller words, so they are plain words instead.

Moonlight is the bright glow of light that comes from the moon. The word takes moon plus light and joins them to describe exactly that.

Adding sea and shell makes seashell, which names the shells we find washed up from the sea. Each tiny word keeps its own meaning inside the new word.

A sidewalk is a path on the side of the road where people walk. Hearing side and walk together shows you the two smaller words that build it.

The word compound means to put things together. That is why any word made by putting two smaller words together is called a compound word.

Sticking side and walk together gives you sidewalk. The new word names the safe path on the side of the street where people walk.

True — you can pull seashell apart into sea and shell, and both pieces are real words. That double-word structure makes it a compound word.

False — blanket cannot be broken into two real words. Blan and ket have no meaning on their own, so blanket is just one plain word.

True — the word moon and the word light are both hiding inside moonlight. Together they describe the silver light we see from the moon at night.

False — length does not matter for compound words. Short words like cupcake or sunset are still compound because they are built from two smaller words joined together.